Today, after a 14-mile bike tour in Chicago, I got rug burn on my inner thighs. Having the hostel room all by myself for the last couple of days, I got naked and let the air conditioner cool me off. I then had to explain to my roommate that walked in on me that I seriously was not jerking off. FML

Ya it's ok, but if you're sharing a hotel room with someone you should do it in the bathroom and not out in the actual room where they can just walk in on you. And it doesn't matter if they hadn't been there for a couple days; they could come back at anytime, such as in OP's case.